package com.yijinsuo.view;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnFocusChangeListener;
import android.view.animation.Animation;
import android.view.animation.CycleInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.EditText;

import com.yijinsuo.R;


public class ClearEditText extends EditText implements  
OnFocusChangeListener , TextWatcher { 
	/**
	 * 删除按钮的引用
	 */
	private Drawable mClearDrawable ; 

	/**
	 * 控件是否有焦点
	 */
	private boolean hasFoucs;

	public ClearEditText(Context context) { 
		this(context, null); 
	} 

	public ClearEditText(Context context, AttributeSet attrs) { 
		//这里构造方法也很重要，不加这个很多属性不能再XML里面定义
		this(context, attrs, android.R.attr.editTextStyle ); 
	} 

	public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}


	private void init() { 
		//获取EditText的DrawableRight,假如没有设置我们就使用默认的图片
		mClearDrawable = getCompoundDrawables()[2]; 
		if ( mClearDrawable == null ) { 
			//throw new NullPointerException("You can add drawableRight attribute in XML");
			mClearDrawable = getResources().getDrawable(R.drawable.delete_selector);
		} 

		mClearDrawable.setBounds( 0 , 0, mClearDrawable.getIntrinsicWidth() , mClearDrawable.getIntrinsicHeight()); 
		//默认设置隐藏图标
		setClearIconVisible(false); 
		//设置焦点改变的监听
		setOnFocusChangeListener(this); 
		//设置输入框里面内容发生改变的监听
		addTextChangedListener(this); 
	} 

	/**
	 * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件
	 * 当我们按下的位置 在  EditText的宽度 - 图标到控件右边的间距 - 图标的宽度  和
	 * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向就没有考虑
	 * 
	 * getWidth() - getTotalPaddingRight()表示:   
	 * 控件左边到clean的图标左边缘的区域 
	 * 
	 * getWidth() - getPaddingRight()表示: 
	 * 控件左边到clean的图标右边缘的区域 
	 * 
     * 所以这两者之间的区域刚好是clean的图标的区域 
	 */
	@Override 
	public boolean onTouchEvent(MotionEvent event) {
		if (event.getAction() == MotionEvent.ACTION_UP) {
			if (getCompoundDrawables()[2] != null) {
				
				boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())
						&& (event.getX() < ((getWidth() - getPaddingRight())));

				if (touchable) {   //点击清除图标
					this.setText( "" ) ;
				}
			}
		}
		return super.onTouchEvent(event) ;
	}

	/**
	 * 当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏
	 */
	@Override 
	public void onFocusChange(View v, boolean hasFocus) { 
		this.hasFoucs = hasFocus;
		if (hasFocus) { 
			setClearIconVisible(getText().length() > 0); 
		} else { 
			setClearIconVisible(false); 
		} 
	} 


	/**
	 * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
	 * @param visible
	 */
	protected void setClearIconVisible(boolean visible) { 
		Drawable right = visible ? mClearDrawable : null; 
		setCompoundDrawables(getCompoundDrawables()[0], 
				getCompoundDrawables()[1], right, getCompoundDrawables()[3]); 
	} 


	/**
	 * 当输入框里面内容发生变化的时候回调的方法
	 */
	@Override 
	public void onTextChanged(CharSequence s, int start, int count, 
			int after) { 
		if(hasFoucs){
			setClearIconVisible(s.length() > 0);
		}
	} 

	@Override 
	public void beforeTextChanged(CharSequence s, int start, int count, 
			int after) { 

	} 

	@Override 
	public void afterTextChanged(Editable s) { 

	} 


	/**
	 * 设置晃动动画
	 */
	 public void setShakeAnimation(){
		 this.startAnimation( shakeAnimation( 5 ) );
	 }


	 /**
	  * 晃动动画
	  * @param counts 1秒钟晃动多少下
	  * @return
	  */
	 public static Animation shakeAnimation(int counts){
		 Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
		 translateAnimation.setInterpolator(new CycleInterpolator(counts));
		 translateAnimation.setDuration( 1000 );
		 return translateAnimation;
	 }
}
